What's the difference in the Riemann tensor and the hessian in terms of the curvature information they measure? Is the riemann tensor contains curvature information at a point that is from the hessian already (that is is the curvature information from the hessian a subset of that in the riemann tensor?

This is joked about all the time, but...
Can tin foil hats actually block anything? If they can, what frequencies? Is there any research into tin or aluminum foil and radio blocking or amplifying abilities when shaped into a hat?
If they really don't do anything, what would be better? Radio blo...

@0celo7 @ACuriousMind I remember asking you about the $1/2\pi i$ in the CFT charge $Q = \dfrac{1}{2\pi i}\int dz T(z) \varepsilon(z)$, think it's partially explained on page 55, section 7.5, here itp.phys.ethz.ch/research/qftstrings/archive/13HSStrings/… if you grok 7.46, point is there is an explanation, wahoo!

Just musing -- there are a measurable number of questions which, while more or less physics-related, are a much better fit for what-if.xkcd. Is it worth creating a "what-if" tag for these?
The discussion at Are outlandish XKCD style What If questions welcome here? seems to suggest at least som...

That being said, the APS meetings do often have some interesting presentations on education research, which might make it worthwhile for you. And I think (though not sure) you get a substantial discount on meeting fees for being a member.

I'm playing a Gnoll Cleric who worships Erythnul in a D&D 3.5e game. Sadly one of my party members died in our last session (he's not a Gnoll). I would like to do something with his body (not just leave it where it fell).
What are the funerary rites of an Erythnulian Gnoll?
As a lore question, ...

"Too broad" is not a characterization that depends on the answerer. It means a good answer is necessarily almost a book, since it needs to take so many things into account. If it doesn't need to, then the question could as well be answered on one of the existing science sites.

Also, I don't think "polymaths" still exist, we have accumulated far too much knowledge for that

What exists is people knowing things from more than one subject, but that's far from being a polymath, i.e. an actual scholar of multiple subjects.

Sorry, I see faults in your reasoning, don't you think good answer to be not necessarily a book, if the answerer is really a polymath (atleast who is trying to become a polymath)? Atleast answer to the question which linked need not need a book...

@NeuroFuzzy: Sorry, the question I asked was more alligned towards math, but it does require expertise in math and history along with some physical intuition. We can find many questions which require knowledge of different fields of science...

Proposal: Polymath
I have seen questions being cross-posted. I want to make a site for those type of questions which requires polymathic folks. If the questions posted in poymath site is tagged with different subjects (and SE exists for that subject), say physics, math and history; we can progra...

Lawrence Peter "Yogi" Berra (May 12, 1925 – September 22, 2015) was an American professional baseball catcher, manager, and coach who played 19 seasons in Major League Baseball (MLB) (1946–63, 1965), all but the last for the New York Yankees. An 18-time All-Star and 10-time World Series champion as a player, Berra had a career batting average of .285, while compiling 358 home runs and 1,430 runs batted in. He is one of only four players to win the American League Most Valuable Player Award three times. Widely regarded as one of the greatest catchers in baseball history, he was elected to the Baseball...

user54412

@ACuriousMind Is it good? I've heard it's fun, but I've also heard it really fakes the dynamics in a number of ways.

@ChrisWhite Well...given the weird contraptions I've brought into flight, I'd guess at least the aerodynamics are not that realistic...but realistic enough that I've killed about three dozen kerbonauts trying to get one into a stable orbit :P

Proposed Q&A site for polymathic community. The site covers CRITICAL questions which can be answered only by a partially or completely polymath field expert, and which may not be answerable by a unique/non-polymath field expert.